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linux信号解释（1）-Linux菜鸟
source link: http://blog.51cto.com/lythjq/2074188
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信号种类非可靠信号（非实时信号）从UNIX系统继承过来的信号，表现为信号不支持排队，可能会丢失信号，例如多次相同信号，进程只能收到一次。可靠信号（实时信号）linux改进信号机制，表现为支持信号排队，
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